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/* Traditional frame unwind support, for GDB the GNU Debugger.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef TRAD_FRAME_H
#define TRAD_FRAME_H
#include "frame.h" /* For "struct frame_id". */
struct frame_info;
struct regcache_map_entry;
struct trad_frame_cache;
/* A simple, or traditional frame cache.
The entire cache is populated in a single pass and then generic
routines are used to extract the various cache values. */
struct trad_frame_cache *trad_frame_cache_zalloc (struct frame_info *);
/* This frame's ID. */
void trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
struct frame_id this_id);
void trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
struct frame_id *this_id);
void trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
CORE_ADDR this_base);
CORE_ADDR trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache);
void trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
int regnum, int realreg);
void trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
int regnum, CORE_ADDR addr);
void trad_frame_set_reg_regmap (struct trad_frame_cache *this_trad_cache,
const struct regcache_map_entry *regmap,
CORE_ADDR addr, size_t size);
void trad_frame_set_reg_value (struct trad_frame_cache *this_cache,
int regnum, LONGEST val);
/* Given the cache in THIS_TRAD_CACHE, set the value of REGNUM to the bytes
contained in BYTES with size SIZE. */
void trad_frame_set_reg_value_bytes (struct trad_frame_cache *this_trad_cache,
int regnum,
gdb::array_view<const gdb_byte> bytes);
struct value *trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
struct frame_info *this_frame,
int regnum);
/* Describes the kind of encoding a stored register has. */
enum class trad_frame_saved_reg_kind
{
/* Register value is unknown. */
UNKNOWN = 0,
/* Register value is a constant. */
VALUE,
/* Register value is in another register. */
REALREG,
/* Register value is at an address. */
ADDR,
/* Register value is a sequence of bytes. */
VALUE_BYTES
};
/* A struct that describes a saved register in a frame. */
struct trad_frame_saved_reg
{
/* Setters */
/* Encode that the saved register's value is constant VAL in the
trad-frame. */
void set_value (LONGEST val)
{
m_kind = trad_frame_saved_reg_kind::VALUE;
m_reg.value = val;
}
/* Encode that the saved register's value is stored in register REALREG. */
void set_realreg (int realreg)
{
m_kind = trad_frame_saved_reg_kind::REALREG;
m_reg.realreg = realreg;
}
/* Encode that the saved register's value is stored in memory at ADDR. */
void set_addr (LONGEST addr)
{
m_kind = trad_frame_saved_reg_kind::ADDR;
m_reg.addr = addr;
}
/* Encode that the saved register's value is unknown. */
void set_unknown ()
{
m_kind = trad_frame_saved_reg_kind::UNKNOWN;
}
/* Encode that the saved register's value is stored as a sequence of bytes.
This is useful when the value is larger than what primitive types
can hold. */
void set_value_bytes (gdb::array_view<const gdb_byte> bytes)
{
/* Allocate the space and copy the data bytes. */
gdb_byte *data = FRAME_OBSTACK_CALLOC (bytes.size (), gdb_byte);
memcpy (data, bytes.data (), bytes.size ());
m_kind = trad_frame_saved_reg_kind::VALUE_BYTES;
m_reg.value_bytes = data;
}
/* Getters */
LONGEST value () const
{
gdb_assert (m_kind == trad_frame_saved_reg_kind::VALUE);
return m_reg.value;
}
int realreg () const
{
gdb_assert (m_kind == trad_frame_saved_reg_kind::REALREG);
return m_reg.realreg;
}
LONGEST addr () const
{
gdb_assert (m_kind == trad_frame_saved_reg_kind::ADDR);
return m_reg.addr;
}
const gdb_byte *value_bytes () const
{
gdb_assert (m_kind == trad_frame_saved_reg_kind::VALUE_BYTES);
return m_reg.value_bytes;
}
/* Convenience functions, return true if the register has been
encoded as specified. Return false otherwise. */
bool is_value () const
{
return m_kind == trad_frame_saved_reg_kind::VALUE;
}
bool is_realreg () const
{
return m_kind == trad_frame_saved_reg_kind::REALREG;
}
bool is_addr () const
{
return m_kind == trad_frame_saved_reg_kind::ADDR;
}
bool is_unknown () const
{
return m_kind == trad_frame_saved_reg_kind::UNKNOWN;
}
bool is_value_bytes () const
{
return m_kind == trad_frame_saved_reg_kind::VALUE_BYTES;
}
private:
trad_frame_saved_reg_kind m_kind;
union {
LONGEST value;
int realreg;
LONGEST addr;
const gdb_byte *value_bytes;
} m_reg;
};
/* Reset the saved regs cache, setting register values to REALREG. */
void trad_frame_reset_saved_regs (struct gdbarch *gdbarch,
trad_frame_saved_reg *regs);
/* Return a freshly allocated (and initialized) trad_frame array. */
trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *);
trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct gdbarch *);
/* Given the trad_frame info, return the location of the specified
register. */
struct value *trad_frame_get_prev_register (struct frame_info *this_frame,
trad_frame_saved_reg this_saved_regs[],
int regnum);
#endif
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